CN114316496A - High-filling scratch-resistant extrusion-grade thermoplastic elastomer material and preparation method thereof - Google Patents
High-filling scratch-resistant extrusion-grade thermoplastic elastomer material and preparation method thereof Download PDFInfo
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Abstract
The application belongs to the technical field of thermoplastic elastomers, and particularly relates to a high-filling scratch-resistant extrusion-grade thermoplastic elastomer material and a preparation method thereof, wherein the thermoplastic elastomer material comprises the following components in parts by weight: 100 parts of styrene elastomer, 30-150 parts of filling oil, 10-300 parts of polyolefin, 1-50 parts of slipping auxiliary agent, 50-300 parts of modified inorganic filler and 0.1-10 parts of lubricant. The application discloses a scrape white extrusion level thermoplastic elastomer material of resistant is filled to height, compatibility is good between substrate styrene elastomer and filling oil and the polyolefin, each component can the homogeneous mixing improve the processability, and add the system after the inorganic filler is modified, can disperse more evenly, not only can effectively promote the temperature resistance of material, performances such as noise insulation, can also show the scrape white resistance that improves the material, avoid the inorganic filler of direct addition poor with the fusibility of system and lead to forming surface defects such as decorative pattern, flow mark, shrink pit, skinning, swell on the product surface.
Description
Technical Field
The application belongs to the technical field of thermoplastic elastomers, and particularly relates to a high-filling scratch-resistant extrusion-grade thermoplastic elastomer material and a preparation method thereof.
Background
Compared with the traditional rubber elastomer, the thermoplastic elastomer material of the styrene has excellent elasticity without vulcanization, so that the thermoplastic elastomer material can be processed by simple plastic processing modes such as injection molding, extrusion molding and the like, can be recycled, and belongs to a non-toxic environment-friendly material. The novel thermoplastic elastomer material basically has the characteristics of ageing resistance, oil resistance, low temperature resistance, wear resistance, high elasticity and the like which are comparable to those of the traditional elastomer, and the product has comfortable hand feeling, so the product can be widely applied to various fields of sports equipment, medical equipment, automotive interior, tools, toys and the like.
In the material modification formula design, by adding the inorganic mineral filler, on one hand, the cost of the material can be reduced, on the other hand, the temperature resistance of the material can be improved, the sound insulation performance of the material is improved, and the like, but the defect of poor scratch and white resistance can be caused; the extrusion-grade material needs to have higher melt strength at a specific temperature, and the fluidity of each component needs to be close in a combined formula system, so that the surface defects of patterns, flow marks, shrinkage pits, peeling, bulges and the like formed on the surface of a product due to overlarge difference of the fluidity of different components in the extrusion process are avoided.
In view of this, it is necessary to design a new material modification formula, so that the prepared material has good scratch and white resistance, excellent extrusion stability, and no adverse phenomena such as patterns and peeling on the surface of the prepared product.
Disclosure of Invention
In order to solve the problems, the application discloses a high-filling scratch-resistant extrusion-grade thermoplastic elastomer material and a preparation method thereof, wherein a styrene elastomer is used as a base material of the thermoplastic elastomer material, and the styrene elastomer material has better compatibility with added filling oil and polyolefin, so that all components can be uniformly mixed to improve the processing performance of the elastomer, and an inorganic filler is added into a system after modification and can be more uniformly dispersed in the system, thereby not only effectively improving the performances of the material, such as temperature resistance, sound insulation and the like, but also remarkably improving the scratch-resistant white performance of the thermoplastic elastomer material, and avoiding the formation of surface defects, such as patterns, traces, shrinkage pits, peeling, bulges and the like, on the surface of a product due to poor fusion of the directly added inorganic filler and the system.
In a first aspect, the application provides a high-filling scratch-resistant extrusion-grade thermoplastic elastomer material, which adopts the following technical scheme:
a high-filling scratch and white resistant extrusion-grade thermoplastic elastomer material comprises the following components in parts by weight:
the matrix material styrene elastomer adopted by the application has better compatibility with the filling oil and the polyolefin, the processing performance of the elastomer can be effectively improved by adding the filling oil and the polyolefin, in addition, the modified inorganic filler is filled in the base material, the inorganic filler can be better dispersed in the base material, the scratch and white resistance of the thermoplastic elastomer material can be improved while the performances such as temperature resistance, sound insulation and the like of the material are improved, the problem that the inorganic filler directly added is not uniformly dispersed due to poor compatibility with a system is avoided, the fluidity difference with the base material is overlarge, and therefore the surface defects such as patterns, flow marks, shrinkage pits, peeling, bulging and the like are effectively avoided being formed on the surface of a product.
Preferably, the styrene elastomer is one or more of styrene-ethylene/butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer and styrene-ethylene/propylene-styrene block copolymer, and the molecular weight of the styrene elastomer is more than or equal to 15 ten thousand.
Preferably, the extender oil is one or both of a white oil and a naphthenic oil; the flash point of the filling oil is more than 200 ℃, and the kinematic viscosity is more than 30mm at 40 DEG C2/s。
The selected filling oil has good compatibility with the styrene elastomer, and can ensure that the whole fluidity of the system is uniform in the extrusion process, avoid uneven extrusion and improve the processing performance.
Preferably, the polyolefin is polypropylene, the polypropylene having a melt index of no more than 10g/10 min.
The polypropylene with the melt index below 10g/10min is selected to be beneficial to reducing the integral melt index of the material, and the polypropylene has good melt strength and improves the scratch and white resistance.
Preferably, the slipping auxiliary agent is silicone master batch capable of reducing the surface friction coefficient; the lubricant is one or more of polyethylene wax, erucic amide, calcium stearate, oleamide and zinc stearate.
The addition of the slipping auxiliary agent can ensure that the whole hand feeling of the material is slipping and not sticky.
Preferably, the modified inorganic filler is an inorganic filler treated by a silane coupling agent, and the using amount of the silane coupling agent is 0.2-3% of the total mass of the inorganic filler; the inorganic filler is one or two of calcium carbonate and barium sulfate.
The silane coupling agent is adopted to carry out surface treatment on the inorganic filler, so that organic groups can be grafted and coated on the surface of inorganic filler particles, the compatibility of the inorganic filler and a system is effectively improved, the dispersion effect is improved, the phenomenon that the overall performance of the material is influenced by the agglomeration of the inorganic filler particles is avoided, the scratch and white resistance is improved, and the surface defects of patterns, flow marks, shrinkage pits, peeling, bulges and the like are prevented from being formed on the surface of a product.
Preferably, the silane coupling agent has a structural formula:
the inventor finds in experiments that the structure of the antioxidant 1076 is introduced into the silane coupling agent, and then the inorganic filler is modified by the coupling agent, so that the antioxidant structure can be well grafted on the surface of the inorganic filler, the dispersing effect of the inorganic filler can be improved, the antioxidant structure can be well dispersed in the whole system, and the condition that the micromolecular antioxidant influences the material performance can be effectively reduced. Moreover, the antioxidant is grafted on the surface of the inorganic filler particles, so that a good fixing effect can be achieved, the situation that small molecules of the antioxidant 1076 gradually lose the antioxidation effect due to the fact that the small molecules of the antioxidant 1076 migrate and separate out along with the lapse of time like the situation that the antioxidant 1076 is directly added is avoided, and the antioxidant structure introduced in a silane coupling agent mode can achieve a long-term antioxidation effect in the material.
The preparation method of the silane coupling agent comprises the following steps:
(1) adding 100 parts of beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) methyl propionate and 95-100 parts of 17-octadecenol into a reaction kettle, adding 14-15 parts of sodium methoxide and 9.5-10.5 parts of dimethyl sulfoxide, heating while stirring to melt and dissolve all raw materials, controlling the temperature at 140 ℃ to perform transesterification reaction for 3 hours, reducing the temperature in the reaction kettle to 80-90 ℃ after the reaction is finished, adding acetic acid to neutralize the sodium methoxide, continuously reducing the temperature to 30 ℃, adding petroleum ether into the product to perform extraction, and sequentially washing, cooling, crystallizing, filtering and drying an oil phase after layering to obtain a crude product of the product A; adding ethanol and ethyl acetate in a mass ratio of 2:1 into a container, adding a crude product of a product A, stirring and heating until reflux, filtering insoluble substances while hot after the crude product is completely dissolved, distilling and concentrating filtrate, cooling to separate out the product A by crystallization, finally performing centrifugal separation, and drying separated crystals to obtain the product A, wherein the reaction process is as follows:
(2) adding 100 parts of the product A into a reaction kettle, heating and melting, then adding 35-40 parts of triethoxysilane and 30ppm of platinum catalyst, stirring and heating to 85 ℃, and reacting for 6-8h to obtain a silane coupling agent, wherein the reaction process is as follows:
preferably, the modified inorganic filler has an average particle size of 3.5 μm or less.
In a second aspect, the application provides a preparation method of a high-filling scratch-white-resistant extrusion-grade thermoplastic elastomer material, which adopts the following technical scheme:
a preparation method of a high-filling scratch and white resistant extrusion grade thermoplastic elastomer material comprises the following steps:
mixing materials: weighing 100 parts of oil-chargeable thermoplastic styrene elastomer and 30-150 parts of filling oil, adding into a mixer, and stirring at high speed for 0.1-10 minutes to prepare a styrene elastomer mixture with uniform oil absorption; on the basis of the prepared elastomer mixture, sequentially adding 10-300 parts of polyolefin, 1-50 parts of a slipping auxiliary agent, 50-300 parts of a modified inorganic filler and 0.1-10 parts of a lubricant into a mixer, and mixing and stirring uniformly;
and (3) extruding and granulating: and (3) melting, extruding and granulating the mixture combined according to the formula by a single-screw or double-screw extruder.
Preferably, the rotating speed of the mixer in the mixing step is more than 160 revolutions per minute;
the extruder adopted in the extrusion granulation step is a double-screw extruder, the length-diameter ratio of the double-screw extruder is at least 25:1, and the melt extrusion temperature is 170-240 ℃.
The application has the following beneficial effects:
(1) the application discloses a high-filling scratch-resistant white-extrusion-grade thermoplastic elastomer material, styrene elastomers are used as matrix materials, and the high-filling scratch-resistant white-resistant thermoplastic elastomer material has good compatibility with added filling oil and polyolefin, so that the components can be uniformly mixed to improve the processing performance of the elastomer, and inorganic fillers are added into a system after modification, and can be more uniformly dispersed in the system, so that the performances of the material such as temperature resistance and sound insulation can be effectively improved, the scratch-resistant white resistance of the thermoplastic elastomer material can be remarkably improved, and the problem that the surface defects such as patterns, flow marks, shrinkage pits, peeling and bulges are formed on the surface of a product due to poor fusion of the directly added inorganic fillers and the system is avoided.
(2) This application adopts silane coupling agent to carry out surface treatment to inorganic filler, can make the surface grafting of inorganic filler granule wrap organic group to effectively promote the compatibility of inorganic filler and system, improve dispersion effect, avoid inorganic filler granule to reunite and influence the wholeness ability of material, promote resistant white performance, avoid forming surface defects such as decorative pattern, flow mark, shrink hole, skinning, swell on the product surface.
(3) Silane coupling agent is introduced with antioxidant 1076's structure to this application, adopts this coupling agent to modify inorganic filler again, can graft the antioxidant structure on the surface of inorganic filler well, not only can improve the dispersion effect of inorganic filler, also can make antioxidant structure disperse in whole system better simultaneously to can effectively reduce the condition that micromolecular antioxidant influences material performance. Moreover, the antioxidant is grafted on the surface of the inorganic filler particles, so that a good fixing effect can be achieved, the situation that small molecules of the antioxidant 1076 gradually lose the antioxidation effect due to the fact that the small molecules of the antioxidant 1076 migrate and separate out along with the lapse of time like the situation that the antioxidant 1076 is directly added is avoided, and the antioxidant structure introduced in a silane coupling agent mode can achieve a long-term antioxidation effect in the material.
(4) The thermoplastic elastomer material has good extrusion performance, and the hardness is 30A-99A Shore; the material has a melt index less than 10g/10min (190 ℃, 2.16kg) and excellent melt strength; the inorganic mineral filling proportion is more than or equal to 15 percent; the scratch and white resistance is excellent.
(5) The thermoplastic elastomer material prepared by the formula has the characteristic of good scratch and white resistance, and the test result of a cross scratch tester tested in the Q/JLY J7110281E-2019 standard according to the standard of Jili automobiles meets the requirement that the Delta L is less than or equal to 1.5.
Detailed Description
The present application will now be described in further detail with reference to examples.
The examples and comparative examples of the present application use the following raw materials:
styrene elastomer SEBS-1: YH503, medium petrochemical group Baling petrochemical, the molecular weight is more than or equal to 15 ten thousand;
styrene elastomer SEBS-2: YH501, medium petrochemical group Baling petrochemical, its molecular weight is less than 15 ten thousand;
softening oil extender oil: 250N, Korea Shuanglong, kinematic viscosity at 40 ℃ is more than or equal to 30mm2/s；
Polyolefin polypropylene-1: PPH-T03, Shanghai petrochemical division of China petrochemical group, melt index < 10g/10 min;
polyolefin polypropylene-2: PP Y2600, Shanghai petrochemical company, China petrochemical group, melt index not less than 10g/10 min;
inorganic filler: ultrafine calcium carbonate, the Jiangsu Dongli ultrafine powder company Limited, the average particle size of the calcium carbonate is less than or equal to 3.5 microns, and the calcium carbonate is not modified;
the silicone master batch as the slipping auxiliary agent: LYSI-300C, silicone master batch, Dorsike;
lubricant zinc stearate, polyethylene wax, oleic acid amide: the commercial routine is carried out;
antioxidant 1076: is commercially available.
The preparation method of the modified inorganic filler comprises the following steps: adding 1.5 parts of silane coupling agent into a mixed solution of ethanol and ethyl acetate (the mass ratio of the ethanol to the ethyl acetate is 2:1), heating to 70 ℃, continuously stirring to form a solution, then adding 100 parts of inorganic filler, modifying for 20-30min under an ultrasonic condition, filtering, washing and drying to obtain the modified inorganic filler.
The KH570 modified inorganic filler is prepared in the same manner as the modified inorganic filler described above, except that the silane coupling agent is replaced with KH 570.
The preparation method of the high-filling scratch-resistant extrusion-grade thermoplastic elastomer material comprises the following steps:
mixing materials: weighing 100 parts of oil-chargeable thermoplastic styrene elastomer and 30-150 parts of filling oil, adding into a mixer, and stirring at high speed for 0.1-10 minutes to prepare a styrene elastomer mixture with uniform oil absorption; on the basis of the prepared elastomer mixture, sequentially adding 10-300 parts of polyolefin, 1-50 parts of a slipping auxiliary agent, 50-300 parts of a modified inorganic filler and 0.1-10 parts of a lubricant into a mixer, and mixing and stirring uniformly;
and (3) extruding and granulating: and (3) melting, extruding and granulating the mixture combined according to the formula by a single-screw or double-screw extruder.
Wherein the rotating speed of the mixer in the mixing step reaches more than 160 revolutions per minute;
the extruder adopted in the extrusion granulation step is a double-screw extruder, the length-diameter ratio of the double-screw extruder is at least 25:1, and the melt extrusion temperature is 170-240 ℃.
The preparation conditions selected in examples 1 to 5 and comparative examples 1 to 6 of the present application were identical, except for the selection of components and the amounts of the components, as shown in table 1.
TABLE 1
The thermoplastic elastomer materials prepared in examples 1 to 5 and comparative examples 1 to 6 were subjected to the performance test, and the test results are shown in Table 2.
TABLE 2
Note: the performance tests in table 2 illustrate:
melt index: ISO 1133-1:2001, 190 ℃, 2.16 Kg;
scratch and white resistance: Q/JLY J7110281E-2019, D65 standard illuminant, 10 degree viewing angle;
and (3) thermal aging: standing at 135 deg.C for 1000 h.
As can be seen from tables 1 and 2, the thermoplastic elastomer materials prepared in examples 1 to 5 of the present application have a hardness of 66 to 95A, a high mineral filling ratio, an inorganic mineral filling ratio of more than 21%, a melt index of less than 2g/10min, a good melt strength, a scratch and white resistance Δ L of less than 1, and meet the requirement that Δ L is less than or equal to 1.5, and a hardness change rate after thermal aging is less than 2.4%, and an aging resistance is good, wherein in examples 1 and 4, due to the relatively low content of the inorganic filler, the grafted antioxidant structure is relatively small (the amount of the silane coupling agent is 1.5% of the total weight of the inorganic filler), so the hardness change rate after aging is high, i.e., 2.36% and 2.07%, in specific examples, the percentage of the silane coupling agent can be properly increased under the condition that the content of the inorganic filler is small, thereby further improving the aging resistance.
As can be seen from the combination of Table 1 and Table 2, the only difference between the comparative example 1 and the example 1 is that the styrene-based elastomer in the comparative example 1 is SEBS-2 with a molecular weight of less than 15 ten thousand, the melt index of the thermoplastic elastomer material prepared in the comparative example 1 is remarkably increased to 32.00g/10min, the melt strength is not good, the scratch and white resistance reaches-1.39, the scratch and white resistance is poor, the hardness change rate after heat aging reaches 3.08%, and the aging resistance is poor. This is because the low crosslink density of the styrenic elastomer having a relatively small molecular weight leads to a significant increase in melt index, deterioration in strength, and deterioration in aging resistance.
As can be seen from the combination of Table 1 and Table 2, the only difference between the comparative example 2 and the example 2 is that the polyolefin in the comparative example 2 is polypropylene-2 with a melt index of not less than 10g/10min, the melt index of the thermoplastic elastomer material prepared in the comparative example 2 is remarkably increased to 15.83g/10min, the melt strength is not good, and the scratch and white resistance reaches-2.37, which is remarkably poor. This is because higher melt index polyolefins can increase the overall melt index of the thermoplastic elastomer material, affecting melt strength and scratch and white resistance.
As can be seen from the combination of Table 1 and Table 2, comparative example 3 is different from example 5 only in that the inorganic filler in comparative example 3 is KH570 modified inorganic filler, and the thermoplastic elastomer material prepared in comparative example 3 has no significant changes in hardness, melt index and scratch and whitening resistance, but the hardness change rate after heat aging is significantly increased to 8.94%, and the aging resistance is reduced. This is because the KH 570-modified inorganic filler has no antioxidant effect, although it can improve the dispersion effect by grafting an organic group on the surface of the inorganic filler, and therefore, the aging resistance is remarkably reduced.
As can be seen from the combination of Table 1 and Table 2, comparative example 4 is different from example 5 only in that the inorganic filler in comparative example 4 is an unmodified inorganic filler, the scratch and white resistance of the thermoplastic elastomer material prepared in comparative example 4 reaches 2.33, the hardness change rate after heat aging is remarkably increased to 10.36%, and the aging resistance is seriously reduced. This is because the non-modified inorganic filler has a poor dispersion effect in the system, resulting in a decrease in the scratch-and-white resistance, and does not have an antioxidant effect, resulting in a significant decrease in the aging resistance.
As can be seen from the combination of tables 1 and 2, comparative example 5 differs from example 5 only in that comparative example 5 replaces 200 parts of the modified inorganic filler in example 5 with 197 parts of the KH570 modified inorganic filler and 3 parts of the antioxidant 1076, and the thermoplastic elastomer material prepared in comparative example 5 has no significant change in hardness, melt index and scratch and whitening resistance, but the rate of change in hardness after heat aging increases from 1.12% to 1.95% in example 5, and the aging resistance decreases. This is because the small-molecular antioxidant 1076 added alone gradually loses its antioxidant effect by migration and precipitation with the lapse of time, and therefore, the aging resistance effect thereof after 1000 hours at 135 ℃ is inferior to that of example 5.
As can be seen from tables 1 and 2, comparative example 6 is different from example 5 only in that comparative example 6 replaces 200 parts of the modified inorganic filler in example 5 with 197 parts of the unmodified inorganic filler and 3 parts of the antioxidant 1076, the scratch and white resistance of the thermoplastic elastomer material prepared in comparative example 6 reaches 2.19, the hardness change rate after heat aging is remarkably increased to 3.07%, and the aging resistance is reduced. The reason is that the dispersion effect of the unmodified inorganic filler in the system is poor, so that the scratch and white resistance is reduced; the small molecular antioxidant 1076 added alone will migrate and precipitate with time to lose the antioxidant effect gradually, so that the aging resistance is not as good as that of example 5 after 1000h at 135 ℃.
The present embodiment is merely illustrative and not restrictive, and various changes and modifications may be made by persons skilled in the art without departing from the scope of the present invention as defined in the appended claims. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A highly filled scratch and white resistant extruded grade thermoplastic elastomer material characterized by: the paint comprises the following components in parts by weight:
2. a highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 1 wherein: the styrene elastomer is one or more of styrene-ethylene/butylene-styrene block copolymer, styrene-ethylene-propylene-styrene block copolymer and styrene-ethylene/propylene-styrene block copolymer, and the molecular weight of the styrene elastomer is more than or equal to 15 ten thousand.
3. A highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 1 wherein: the filling oil is one or two of white oil and naphthenic oil; the flash point of the filling oil is more than 200 ℃, and the kinematic viscosity is more than 30mm at 40 DEG C2/s。
4. A highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 1 wherein: the polyolefin is polypropylene, and the melt index of the polypropylene is not more than 10g/10 min.
5. A highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 1 wherein: the smooth auxiliary agent is silicone master batch capable of reducing the surface friction coefficient; the lubricant is one or more of polyethylene wax, erucic amide, calcium stearate, oleamide and zinc stearate.
6. A highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 1 wherein: the modified inorganic filler is an inorganic filler treated by adopting a silane coupling agent, and the using amount of the silane coupling agent is 0.2-3% of the total mass of the inorganic filler; the inorganic filler is one or two of calcium carbonate and barium sulfate.
7. The highly filled, scratch and white resistant extruded grade thermoplastic elastomer material of claim 6, wherein: the structural formula of the silane coupling agent is as follows:
8. a highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 1 wherein: the average grain diameter of the modified inorganic filler is less than or equal to 3.5 mu m.
9. A process for the preparation of a highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 1 characterized by: the method comprises the following steps:
mixing materials: weighing 100 parts of oil-chargeable thermoplastic styrene elastomer and 30-150 parts of filling oil, adding into a mixer, and stirring at high speed for 0.1-10 minutes to prepare a styrene elastomer mixture with uniform oil absorption; on the basis of the prepared elastomer mixture, sequentially adding 10-300 parts of polyolefin, 1-50 parts of a slipping auxiliary agent, 50-300 parts of a modified inorganic filler and 0.1-10 parts of a lubricant into a mixer, and mixing and stirring uniformly;
and (3) extruding and granulating: and (3) melting, extruding and granulating the mixture combined according to the formula by a single-screw or double-screw extruder.
10. A process for the preparation of a highly filled scratch and white resistant extruded grade thermoplastic elastomer material as claimed in claim 9 wherein: the rotating speed of the mixer in the mixing step reaches more than 160 revolutions per minute;
the extruder adopted in the extrusion granulation step is a double-screw extruder, the length-diameter ratio of the double-screw extruder is at least 25:1, and the melt extrusion temperature is 170-240 ℃.
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|---|---|
| CN114316496B (en) | 2022-09-20 |
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